Laptop suspends automatically while on AC, despite "Don't suspend" setting

[Michael]

This started a couple of days ago. Ubuntu 11.10, pretty recently updated. When I leave the laptop on AC it suspends after about half an hour of inactivity, although "Power Settings..."/"When plugged in" is set to "Don't suspend".

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: upower 0.9.13-1
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: vboxguest
ApportVersion: 1.23-0ubuntu2
Architecture: amd64
Date: Wed Oct 5 11:50:44 2011
ExecutablePath: /usr/lib/upower/upowerd
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:

SourcePackage: upower
UpgradeStatus: Upgraded to oneiric on 2011-09-27 (8 days ago)

[Michael (michaeljt)]

No longer reproducible, marking as incomplete as I can't close it.

[Launchpad Janitor (janitor)]

[Expired for upower (Ubuntu) because there has been no activity for 60 days.]